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Wide tires, other rims and shock absorbers

What technical changes are allowed on motorcycles in Switzerland? This question is not always easy to answer. What is the Bible for believers are the ASA guidelines 2b for us bikers. In the guidelines, which have been developed by the Federal Office of Roads and Transport, all technical changes to motorcycles are looked at in detail. Among the most important information for hobby screwdrivers and professional bike builders are in particular the necessary documents about a problem-free re-registration of the road. You can find all this and much more information in this biker bible.

Although it deals with all technical changes to motorcycles in Switzerland, we want to go into specific questions in more detail. Important: If you still have unanswered questions despite our comments, you can contact us at any time.

Even better: Use the comment function and help everyone else who is interested in this topic. We are also happy to answer any questions about the comment function.

Your Blackdiamond Motorcycles Team

Which types /dimensions can be installed in Switzerland?

You can change the tyres of your motorcycle at any time – but there are individual points to consider.

  1. The speed index of your motorcycle type must be adhered to (you can find the info in the type approval – best ask the vehicle manufacturer)
  2. Radial and diagonal tyres must not be mixed
  3. For cross tyres with M+S marking, a special rule applies: the speed index does not have to be adhered to here – but they must be able to drive at at least 130 km/h. In this case, the maximum speed with a sticker can be clearly displayed in the area of the driver.
  4. The roll-off circumference of your tyres must not change more than 8 compared to the original tyres. You can
    calculate
    this here, for example.
Cafe Racer Reifen kaufen Schweiz BMW K100

Rims from the accessories?

Cafe Racer Reifen kaufen Schweiz BMW K100

You may convert the rims of your motorcycle at any time. However, it is important that you use rims from renowned manufacturers such as Kineo and buy them in Switzerland. For a problem-free registration on the MFK, a CH suitability declaration is necessary. Of course, the wheels to the frame or other components of your motorcycle must be guaranteed at all times.

Lowering or raising motorcycles, can I?

Yes! You may. In any case, however, you need a CH suitability declaration based on an ABE from the manufacturer. If you want to lower or lower the vehicle, it should be noted that the total length of the strut does not change more than 3 cm compared to the original. If the 3 cm with your desired struts can no longer be adhered to, you need a DTC expert opinion.

Our DTC report for the BMW R models covers the longer struts. More information can be found here.

Welding motorcycle frame, changing sports air filter rear frame

BMW R80 Sitzrohr schweissen
You want to shorten or weld your motorcycle frame? Or are you interested in the typical mushroom air filters on motorcycles? In our next blog post, you will find sweating, sports air filters and rear frames for helpful information.
BMW R80 Sitzrohr schweissen

Image sources

Cover blog post: Black Diamond Motorcycles

Post image BMW R100 Detailed view: Black Diamond Motorcycles

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